BEGIN;
BEGIN
EXPLAIN (ANALYZE, BUFFERS)
select
	l_orderkey,
	sum(l_extendedprice * (1 - l_discount)) as revenue,
	o_orderdate,
	o_shippriority
from
	customer,
	orders,
	lineitem
where
	c_mktsegment = 'HOUSEHOLD'
	and c_custkey = o_custkey
	and l_orderkey = o_orderkey
	and o_orderdate < date '1995-03-08'
	and l_shipdate > date '1995-03-08'
group by
	l_orderkey,
	o_orderdate,
	o_shippriority
order by
	revenue desc,
	o_orderdate
LIMIT 10;
                                                                                             QUERY PLAN                                                                                              
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=2667380.55..2667380.58 rows=10 width=20) (actual time=30144.979..30144.984 rows=10 loops=1)
   Buffers: shared hit=801796 read=554634
   ->  Sort  (cost=2667380.55..2675219.23 rows=3135473 width=20) (actual time=30144.976..30144.978 rows=10 loops=1)
         Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))), orders.o_orderdate
         Sort Method: top-N heapsort  Memory: 25kB
         Buffers: shared hit=801796 read=554634
         ->  HashAggregate  (cost=2568269.38..2599624.11 rows=3135473 width=20) (actual time=30083.304..30126.307 rows=113177 loops=1)
               Group Key: lineitem.l_orderkey, orders.o_orderdate, orders.o_shippriority
               Buffers: shared hit=801790 read=554634
               ->  Hash Join  (cost=550502.39..2521237.28 rows=3135473 width=20) (actual time=7715.188..29869.699 rows=298850 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=801790 read=554634
                     ->  Seq Scan on lineitem  (cost=0.00..1817040.90 rows=32623803 width=12) (actual time=0.026..16418.786 rows=32541562 loops=1)
                           Filter: (l_shipdate > '1995-03-08'::date)
                           Rows Removed by Filter: 27504107
                           Buffers: shared hit=512993 read=553482
                     ->  Hash  (cost=532463.77..532463.77 rows=1443090 width=12) (actual time=7700.137..7700.137 rows=1446872 loops=1)
                           Buckets: 2097152  Batches: 1  Memory Usage: 78555kB
                           Buffers: shared hit=288797 read=1152
                           ->  Hash Join  (cost=49686.93..532463.77 rows=1443090 width=12) (actual time=469.090..7178.657 rows=1446872 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=288797 read=1152
                                 ->  Seq Scan on orders  (cost=0.00..441209.30 rows=7236435 width=16) (actual time=0.017..4394.324 rows=7253170 loops=1)
                                       Filter: (o_orderdate < '1995-03-08'::date)
                                       Rows Removed by Filter: 7761830
                                       Buffers: shared hit=253522
                                 ->  Hash  (cost=45947.81..45947.81 rows=299130 width=4) (actual time=465.118..465.118 rows=299751 loops=1)
                                       Buckets: 524288  Batches: 1  Memory Usage: 14635kB
                                       Buffers: shared hit=35275 read=1152
                                       ->  Bitmap Heap Scan on customer  (cost=6930.69..45947.81 rows=299130 width=4) (actual time=67.925..380.169 rows=299751 loops=1)
                                             Recheck Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                             Heap Blocks: exact=35275
                                             Buffers: shared hit=35275 read=1152
                                             ->  Bitmap Index Scan on customer_c_mktsegment_c_custkey_idx  (cost=0.00..6855.90 rows=299130 width=0) (actual time=59.494..59.494 rows=299751 loops=1)
                                                   Index Cond: (c_mktsegment = 'HOUSEHOLD'::bpchar)
                                                   Buffers: shared read=1152
 Planning time: 5.812 ms
 Execution time: 30175.163 ms
(38 rows)

COMMIT;
COMMIT